Why a wet iron pan often gets rusted if left in that state for some time?Īnswer: A wet iron pan (tawa) often gets rusted if left in that state for some time because iron rust in the presence of oxygen and water.ġ0.
Which technique is better for obtaining sugar from sugar solution?Īnswer: Crystallization is considered as a better technique for obtaining sugar from sugar solution.Īnswer: Large crystals of pure substances can be formed from their solutions. What happens when baking soda is treated with vinegar?Īnswer: Vinegar (Acetic acid) + Baking soda (Sodium hydrogencarbonate) → Carbon dioxide + other substancesħ. Name the two methods by which rusting of iron can be prevented.Īnswer: Two methods by which rusting of iron can be prevented are by painting or greasing and by galvanizing.Ħ. So, it is commonly known as blue vitriol.ĥ. This substance is called rust.Īnswer: Crystals of copper sulphate pentahydrate are blue in colour. Why souring of milk is a chemical change?Īnswer: Souring of milk is a chemical change because it results in formation of new substance.Īnswer: If a piece of iron is left in the open for some time, it acquires a film of brownish substance. Why formation of manure from leaves is a chemical change?Īnswer: Formation of manure from leaves is a chemical change because manure formed has a different composition from leaves.Ģ. What is added to steel to make it stainless?Īnswer: Stainless steel is made by mixing iron with carbon and metals like chromium, nickel and manganese. State the conditions necessary for rusting of iron?Īnswer: For rusting, the presence of both oxygen and water (or water vapour) is essential.Īnswer: The process of depositing a layer of metal like zinc or chromium on iron is called galvanisation.ġ1.
What do you understand by chemical change?Īnswer: A change in which one or more new substances are formed is called a chemical change.ĩ. Which of the two is permanent change chemical change or physical change?Īnswer: Chemical change is a permanent change.Ĩ. What type of change is formation of manure?Īnswer: Formation of manure is a chemical change.ħ. What type of change is involved in rusting of iron?Īnswer: Rusting of iron is a chemical change.ĥ.
What type of change is crystallisation?Ĥ. If you are looking for Science Lesson Plans for Physics, Chemistry, and Biology then you are in the right place.Physical and Chemical Changes Class 7 Science Extra Questions and Answers Very Short Extra Questions and AnswerĪnswer: The process of depositing a layer of zinc over iron is called galvanisation.Īnswer: The formation of rust over the surface of iron is known as rusting.ģ.
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UNIT 6 DAILY 2 CHEMISTRY PDF
Microteaching Skill of Stimulus Variation Parts of Flowers, Pollination, and Fertilization List of All Biological Science Lesson Plans Biology Lesson Plan Microteaching Skill of Introducing Lesson Micro teaching(Skill Of Probing Questions) Microteaching (Skill of Introducing Lesson) List of All Science Lesson Plans Science Lesson Plan in English for School Teachers and B.Ed Free Download PDF You can use them according to your need and requirements by making slight changes in name, class, course, date, duration, etc.Īnd remember that these are the Sample Lesson Plans.
UNIT 6 DAILY 2 CHEMISTRY HOW TO
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